81 x 9 = 801. What must you do to make the this equation true?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Look at the picture and find out which square is not linked with any of the other squares.

Can you count the number of triangles in the picture below?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?